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Well, just a final update.
I preheated the metal to 600F. Welded it in 2" sections alternating ends, etc to kep it from pulling all to ****, let it cool slowly and bolted her in. I could not have asked for it to work any better. Alignment was awesome. Weld seems to be excellent. It has about 50+ passes on it at 150 mph or so. (8) 6.0 runs at 1000' also. This takes 1200+ Hp ish to do. I have always and still do look at it every pass.
Preheat is my friend.
Thanks for the help.
Wags

BTW, I milled a slot in the top plate and pressed the vertical part in to the slot. I welded on the top then and around the bottom. (so this is about 30+ inches of weld total) The tube (that the propshaft goes through) I milled a slot for alignment and it had about .001 press to the vertical piece.

still wanna see pics of that beast in actions, please? i am glad that it worked out for ya. i didnt see this post until now. shoot me a pm next time you need a 2 or 3 foot drop of some heavy beam...... heck, i even have a 6 ft drop of 38 inch beam 390 pound per foot

Preheat 5-600 degrees, if possible weld with a nickel/chromoly rod (such as Arctec's Unicrom series) and cool slowly. If you can't find that rod, ER80S-D2 is a real decent option for MIG wire. In the mean time, have fun!!